Question

Which of the following applications is a correct application of thermal physics?
a.Vacuum flask, heat exchanger, electric kettle
b. Roller coaster, thermometer, refrigerator
c.Refrigerator, AC, water pump
d.Thermal imaging, thermometer, lever

Answer 1

Explanation:

ANSWER

In a thermos flask ,

(a) a thin layer of vacuum is provided between the two walls of flask, to minimise the heat loss by conduction , because for conduction medium (molecules) is required , but now medium is absent .

.(b) the two walls are silvered to minimise the heat loss by radiation , because a shiny surface is a bad absorber and bad emitter of radiation i.e. good reflector of heat , so prevents the heat exchange between content of flask and surrounding .

(c) the lid of flask is provided with a tight cork stopper to minimise the heat loss by convection , so that convection currents cannot go out .

(d) a plastic (or metal) case is provided with a flask , to protect the flask from physical damage .

plz mark as brainliest